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cs.DB2026
Continuous Query for Top- Maximal Sum Intervals over Streaming Data
Zhongshuai Zhang, Xiaochun Yang, Baihua Zheng +3
The continuous identification of top- maximal sum intervals using a sliding window over a data stream is a critical operation for applications in IoT and beyond. A maximal sum i…
cs.DB2026
From Single to Multiple Attributes: Experimental Insights on Sampling-Based Distinct Combination Estimation in GROUP-BY Queries
Yujie Zhang, Xiaochun Yang, Bin Wang +1
Estimating the number of distinct combinations in multi-attribute GROUP-BY queries remains a significant yet underexplored challenge. Current cardinality estimation techniques prim…
cs.DB2026
Low-Latency Out-of-Core ANN Search in High-Dimensional Space
Ziwen Song, Bin Wang, Xiaochun Yang +1
In-memory graph-based approximate nearest neighbor (ANN) search has superior search performance but incurs significant memory footprint. Disk-based methods reduce memory usage but…